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本文用38个遍布云南地区的短周期地震台站的地震仪器记录的160多个区域地震的尾波观测资料,详细研究了云南地区尾波衰减的某些特征,给出了全省地壳尾波Q分布图。在考虑Q值与频率相点的情况下,发现频率相关值η在地震活动频繁的地区比较高,而在相对平静的地区比较低。从尾波Q值的空间分布来看,滇西北地区最低,在70—180之间,东部地区最高,约300—400左右,云南地区总的趋势是自西向东Q值逐渐增高。根据这些研究结果,讨论了尾波衰减的某些特征与地震活动前兆关系的理论基础,把尾波Q值作为地震前兆的可能性研究是具有实际意义的。
In this paper, the cochlear observation data of more than 160 regional earthquakes recorded by seismographs of 38 short-period seismic stations all over Yunnan are used to study some characteristics of coda attenuation in Yunnan Province. Q distribution chart. In the case of considering the phase point of Q value and frequency, it is found that the frequency-dependent value η is relatively high in areas with high seismicity and relatively low in relatively calm areas. From the spatial distribution of coda Q value, the lowest in northwestern Yunnan, between 70-180, the highest in the eastern region, about 300-400, the overall trend in Yunnan is gradually increased from west to east Q value. Based on these results, the theoretical basis of some characteristics of coda wave attenuation and the precursors of seismic activity is discussed. It is meaningful to study the possibility of coda Q value as a precursor of earthquake.